阅读说明：本技术 一种复合端板、包含该端板的电池模组及储能设备 (Composite end plate, battery module comprising same and energy storage equipment ) 是由 桂昊 邓江南 刘晨南 姜斌 于 2021-07-22 设计创作，主要内容包括：本发明涉及动力电池技术领域,具体涉及一种复合端板,包括嵌入件及注塑连接于嵌入件嵌入件的端板主体,嵌入件端板主体的侧端部设置有至少一个定位连接部,嵌入件定位连接部设置有至少一个用于限制嵌入件嵌入件移动的限位结构。由于端板主体和嵌入件采用注塑成型连接在一起,使得端板主体和嵌入件不需要额外装配,大大简化了模组结构,降低电池模组生产装配难度,降低电池模组的零部件及加工成本；由于端板主体为非金属材质,避免了现有技术的金属端板直接接触电池,而导致电池模组内电池温差过大,影响电池模组正常工作、循环寿命等,改善了电池模组内电池温度的一致性差的问题。此外,本发明还公开了一种包含上述复合端板的电池模组及储能设备。(The invention relates to the technical field of power batteries, in particular to a composite end plate which comprises an embedded part and an end plate main body connected to the embedded part in an injection molding mode, wherein the side end part of the embedded part end plate main body is provided with at least one positioning connecting part, and the embedded part positioning connecting part is provided with at least one limiting structure used for limiting the embedded part to move. The end plate main body and the embedded part are connected together by injection molding, so that the end plate main body and the embedded part do not need to be additionally assembled, the module structure is greatly simplified, the production and assembly difficulty of the battery module is reduced, and the parts and the processing cost of the battery module are reduced; because the end plate main part is non-metallic material, avoided prior art's metal end plate direct contact battery, and lead to the battery difference in temperature too big in the battery module, influence normal work of battery module, cycle life etc. has improved the poor problem of uniformity of battery temperature in the battery module. In addition, the invention also discloses a battery module and energy storage equipment comprising the composite end plate.)

1. A composite end plate, comprising: connect in including the embedment and moulding plastics the end plate main part of embedment, the side end of end plate main part is provided with at least one location connecting portion, location connecting portion are provided with at least one and are used for the restriction the limit structure that the embedment removed.

2. The composite end plate of claim 1, wherein: the limiting structure comprises a first joint part arranged in the height direction of the end plate main body and a locking groove arranged in the length direction of the end plate main body; the embedded part is provided with a second joint part matched with the first joint part and a locking convex block matched with the locking groove.

3. The composite end plate of claim 2, wherein: the limiting structure is provided with at least one first stop structure arranged along the thickness direction of the end plate main body, and the embedded part is provided with a second stop structure matched with the first stop structure.

4. The composite end plate of claim 3, wherein: the first joint part and the second joint part are arranged to be mutually matched in a tooth-shaped structure or a block-shaped structure, and the first stop structure and the second stop structure are arranged to be mutually matched in an arc-shaped structure.

5. The composite end plate of claim 1, wherein: the end plate main body is further provided with an output pole accommodating part, at least one locking structure and a plurality of weight reduction grooves distributed in a matrix mode, the locking structure and the output pole accommodating part are of an injection molding integrated structure, and the locking structure is located in the center of the inner part of the output pole accommodating part.

6. The composite end plate of claim 5, wherein: the locking structure is a nut or a screw hole, and the nut comprises a nut body, hobbing arranged outside the nut body, a plurality of annular grooves arranged on the outer ring of the nut body at intervals and an anti-overflow glue ring arranged at the bottom of the nut body.

7. The composite end plate of claim 2, wherein: the quantity of inserts is at least two, every the inserts all include the inserts body, run through in the through hole of inserts body and set up in inserts body lateral part and with the welded part of exterior structural part welded.

8. The composite end plate of claim 7, wherein: the through hole is positioned in the center of the insert body, the cross section of the through hole is regular or irregular, and the regular shape is circular, oval or square.

9. A battery module comprising the composite end plate of any of claims 1-8, wherein: the battery pack is characterized by further comprising a side plate, a plurality of batteries, busbars and output electrode busbars, the number of the composite end plate is at least two, the batteries are placed in an enclosing frame formed by the composite end plate and the side plate in an end-to-end mode, and the batteries are connected in series and parallel through the busbars and then pass through the output electrode busbars to output current.

10. The battery module according to claim 9, wherein: the width W of the composite end plate is K2W, W is the width of the module, and K2 is more than or equal to 0.9 and less than or equal to 1; the thickness t of the composite end plate is K3L, L is the length of the module, and K3 is more than or equal to 0.07 and less than or equal to 0.1.

11. An energy storage device, characterized by: comprising a battery module as claimed in any of claims 9 to 10.

Technical Field

The invention relates to the technical field of power batteries, in particular to a composite end plate, a battery module comprising the same and energy storage equipment.

Background

With the development of technology, the application range of power batteries is wider and wider, and the power batteries relate to production or life. The power battery is also called a secondary battery, and is a rechargeable battery. Power batteries are widely used. The low-capacity power battery may be used for a small electric vehicle, and the high-capacity power battery may be used for a large electric vehicle, such as a hybrid car or an electric car. When the power batteries are used in a group, the power batteries are required to be connected in series or in parallel by using a bus bar. The bus bars are typically welded to the positive and negative poles of the power cell. Each power battery comprises a plurality of battery modules. Each battery module comprises a plurality of single battery cores and end plates and side plates for fixing the single battery cores. The end plates and the side plates are arranged around all the single battery cells. In the prior art, the end plate is of a unitary construction. The end plate all uses the aluminum product with the curb plate, nevertheless all has certain defect with the end plate that the metal material was made, if direct when contacting with the battery for the heat of the battery that is close to the end plate can transmit to the module end plate fast, thereby influences the temperature uniformity of a plurality of batteries in the module, leads to the life of whole module to shorten.

The technical scheme of the existing battery end plate and the battery module is that a metal plane plate is used as the battery end plate, the plane battery end plate is tightly attached to a battery, and large pretightening force is applied to the battery, so that the battery is tightly attached to the battery. However, the battery swells in the life cycle of use, resulting in the increase of the size of the battery module, and the current planar battery end plate cannot absorb the pressure generated by the expansion of the battery well, and once the pressure generated by the expansion of the battery is too large, the battery end plate can bear too large force, so that the deformation and the damage of the battery end plate are caused, and the problem of electrical safety is caused.

In view of this, a battery end plate and a battery module (patent No. 201721713936.4) have been developed to solve the problem that the battery end plate cannot absorb the pressure generated by the expansion of the battery well, and once the pressure generated by the expansion of the battery is too large, the battery end plate can bear too much force, which causes the deformation and damage of the battery end plate, and thus causes the electrical safety. Although the above patent solves the above drawbacks, it brings with it new problems: because there are first end plate, second end plate in the battery module, and need be assembled between first end plate, the second end plate and be connected, greatly increased the module assembly degree of difficulty like this.

In addition, in the assembly process or the use process of the battery module, the battery module vibrates, the output pole base is easy to displace in the height direction of the battery module relative to the end plate, and if the displacement of the output pole base is too large, the battery output pole is driven to shake, so that the connection between the battery output pole and the connecting plate or between the connecting plate and the pole is disconnected; and the battery output pole is still often connected with the sampling aluminum wire through the bonding mode, and when the battery output pole rocks, also very easily causes its and sampling aluminum wire disconnection to influence the reliability of battery module.

In view of the above, a battery module (patent No. 201820401259.0) has been developed, in which one of the battery module is provided with a clamping groove and the other is provided with an elastic part, the elastic part is in clamping fit with the clamping groove to increase the friction between the output electrode base and the end plate through the pressing fit of the elastic part and the clamping groove, so as to limit the degree of freedom of the output electrode base in the height direction of the battery module, so that, even if the battery module vibrates during the assembly or use of the battery module, the relative displacement between the output electrode base and the end plate in the height direction can be limited, thereby preventing the battery output electrode from shaking seriously due to the too large displacement of the output electrode base relative to the end plate, improving the connection reliability between the battery output electrode and the connecting plate and between the connecting plate and the terminal post, and the connection reliability between the battery output electrode and the sampling aluminum wire, the reliability of the battery module is improved. Although the above-mentioned patent solves the above drawbacks, it brings with it new problems: this battery module needs extra output pole base (increase the part), and still need have the assembly relation with the end plate, has also increased the module assembly degree of difficulty simultaneously.

Disclosure of Invention

One of the objects of the present invention is: for solving the problem of prior art, and provide a compound end plate, improved the poor problem of uniformity of battery temperature in the battery module, simplified battery module structure greatly, reduced the battery module production assembly degree of difficulty, reduced the spare part and the processing cost of battery module.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a composite end plate, include the embedment and mould plastics connect in the end plate main part of embedment, the side end of end plate main part is provided with at least one location connecting portion, location connecting portion are provided with at least one and are used for the restriction the limit structure that the embedment removed. The end plate main body and the embedded part are connected together by injection molding, so that the end plate main body and the embedded part do not need to be additionally assembled, the module structure is greatly simplified, the production and assembly difficulty of the battery module is reduced, and the parts and the processing cost of the battery module are reduced; the end plate main body is made of a non-metal material, so that the problem that the temperature difference of the battery in the battery module is too large to influence the normal work, the cycle life and the like of the battery module due to the fact that the metal end plate in the prior art is in direct contact with the battery is avoided, the problem of poor consistency of the temperature of the battery in the battery module is solved, and the safety of the battery module is improved; because the setting of location connecting portion and limit structure for embedding piece and end plate main part joint strength are better, at battery module during operation, have strengthened the stability of work, have prolonged life.

As an improvement of the composite end plate of the present invention, the limiting structure includes a first engaging portion disposed in the height direction of the end plate body and a locking recess disposed in the length direction of the end plate body; the embedded part is provided with a second joint part matched with the first joint part and a locking convex block matched with the locking groove.

As an improvement of the composite end plate, the limiting structure is provided with at least one first stop structure arranged along the thickness direction of the end plate main body, and the embedded part is provided with a second stop structure matched with the first stop structure.

As an improvement of the composite end plate of the present invention, the first engaging portion and the second engaging portion are configured as mutually matched tooth-shaped structures or block-shaped structures, and the first stop structure and the second stop structure are configured as mutually matched arc-shaped structures.

As an improvement of the composite end plate, the end plate main body is further provided with an output electrode accommodating part, at least one locking structure and a plurality of weight reduction grooves distributed in a matrix mode, the locking structure and the output electrode accommodating part are of an injection molding integrated structure, and the locking structure is located in the center of the interior of the output electrode accommodating part.

As an improvement of the composite end plate, the locking structure is a nut or a screw hole, and the nut comprises a nut body, hobbing arranged outside the nut body, a plurality of annular grooves arranged on the outer ring of the nut body at intervals and an anti-overflow rubber ring arranged at the bottom of the nut body.

As an improvement of the composite end plate of the present invention, the number of the inserts is at least two, and each insert includes an insert body, a through hole penetrating through the insert body, and a welding portion disposed at a side portion of the insert body and welded to an external structural member.

As an improvement of the composite end plate of the present invention, the through hole is located in the center of the insert body, the cross-sectional shape of the through hole is a regular shape or an irregular shape, and the regular shape is a circle, an ellipse or a square.

The second purpose of the invention is to provide a battery module comprising the above composite end plate, the module further comprises a side plate, a plurality of batteries, a bus bar and an output electrode bus bar, the number of the composite end plates is at least two, the plurality of batteries are placed in an enclosure frame formed by connecting the composite end plate and the side plate end to end, and the plurality of batteries are connected in series and parallel through the bus bar and then output current through the output electrode bus bar.

The width W of the composite end plate is K2W, W is the width of the module, and K2 is more than or equal to 0.9 and less than or equal to 1; the thickness t of the composite end plate is K3L, L is the length of the module, and K3 is more than or equal to 0.07 and less than or equal to 0.1.

The welding part of the composite end plate is welded with the side plate through laser welding, friction stir welding, cold metal transition welding, resistance welding, argon arc welding or gas shield welding, and the welding width is 2-10 mm.

The third objective of the present invention is to provide an energy storage device, which includes the above battery module.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of an end plate body according to embodiment 1 of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural view of an insert according to embodiment 1 of the present invention.

Fig. 5 is an enlarged view of B in fig. 4.

Fig. 6 is a schematic structural view of a nut according to embodiment 1 of the present invention.

Fig. 7 is a cross-sectional view of the nut of fig. 6.

Fig. 8 is a schematic structural view of embodiment 2 of the present invention.

Fig. 9 is an enlarged view at C in fig. 8.

Wherein: 1-insert, 2-end plate body, 10-composite end plate, 20-positioning connection

11-insert body, 12-through hole, 13-second joint, 14-locking lug, 15-second stop structure, 16-welding part,

21-output pole accommodating part, 22-locking structure, 22' -nut, 23-limiting structure, 24-weight reducing groove,

221-nut body, 222-hobbing, 223-annular groove, 224-anti-overflow rubber ring,

231-first engaging part, 232-first stop structure, 233-locking recess,

100-battery module, 101-side plate, 102-battery, 103-bus bar, 104-output pole bus bar.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

Detailed description of the preferred embodiment 1

As shown in fig. 1-7, a composite end plate, connect in the end plate main part 2 of embedment 1 including embedment 1 and moulding plastics, end plate main part 2 adopts polymer plastics, and polymer plastics's coefficient of thermal conductivity is low, avoided among the prior art metal end plate direct and battery contact (metal end plate and battery direct contact can make the battery that is close to the end plate compare in the battery heat dissipation at module middle part faster), and lead to the battery difference in temperature in the battery module too big, influence battery module normal work, cycle life etc., and then improved the poor problem of uniformity of battery temperature in the battery module. Specifically, the end plate main body 2 is made of at least two composite materials of polyamide plastic, polycarbonate plastic, polyethylene, polyformaldehyde plastic, polybutylene terephthalate plastic, polyphenyl ether plastic, glass fiber and ABS plastic, preferably the composite material of polycarbonate plastic and ABS plastic or the composite material of polyamide plastic and glass fiber, and the combination mode is adopted, so that the injection molding difficulty and cost are reduced, and the structural strength is improved; wherein, the ABS plastic is a terpolymer of acrylonitrile A, butadiene B and styrene S.

The embedded part 1 and the end plate main body 2 of the embodiment are of an integrally formed structure, the embedded part 1 and the end plate main body 2 do not need to be additionally assembled, the assembly process is omitted, the structure of the battery module is simplified, the production and assembly difficulty of the battery module is reduced, the parts and the processing cost of the battery module are reduced, and batch production is convenient to realize.

The side end of the end plate main body 2 of this embodiment is provided with at least one location connecting portion 20, the quantity of location connecting portion 20 is two, two location connecting portions 20 set up respectively in the both sides tip of end plate main body 2, closely fixed together with embedded part 1 in the location connecting portion 20 injection moulding process, finally form an overall structure, this overall structure's structural strength is more excellent than current assembly structure's intensity, be favorable to improving the stability that the battery module used, increase of service life. In addition, the positioning connection part 20 of the embodiment is provided with at least one limiting structure 23 for limiting the movement of the insert 1, the number of the limiting structures 23 can be set according to needs, the structural strength of the invention is further enhanced due to the arrangement of the limiting structures 23, the movement of the insert 1 in the XYZ direction can be limited, the insert 1 and the end plate main body 2 are connected more firmly, and the stability of the battery module in different working environments is improved.

Further, the limit structure 23 includes a first engagement portion 231 provided in the height direction of the end plate main body 2 and a locking recess 233 provided in the length direction of the end plate main body 2; the insert 1 is provided with a second engagement 13 portion matching the first engagement portion 231 and a locking projection 14 cooperating with the locking recess 233. The position-limiting structure 23 has at least one first stop structure 232 arranged along the thickness direction of the end plate body 2, and the insert 1 has a second stop structure 15 cooperating with the first stop structure 232. The first joint part 231 and the second joint part 13, the locking groove 233 and the locking convex block 14, and the first stop structure 232 and the second stop structure 15 are in one-to-one correspondence, and in the injection molding process, the second joint part 13, the locking convex block 14 and the second stop structure 1515 of the insert 1 are respectively in fixed fit connection with the first joint part 231, the locking groove 233 and the first stop structure 232 of the end plate main body 2, so that the assembly process is reduced, and the connection strength is greatly improved.

Specifically, the first engaging portion 231 and the second engaging portion 13 are provided as a mutually matching tooth-like structure or block-like structure, which is easier to engage, because the first engaging portion 231 and the second engaging portion 13 need to be tightly connected, and a certain connecting strength is required between them, and they cannot be loosened by their use in the future. The first stopper structure 232 and the second stopper structure 15 are provided as arc structures that match each other, and the first stopper structure 232 and the second stopper structure 15 are used to restrict the relative position of the insert 1 and the end plate body 2 in the width direction from moving, which enhances the connection strength.

The end plate body 2 of the present embodiment is further provided with an output pole accommodating portion 21, at least one locking structure 22 and a plurality of weight-reducing grooves 24 distributed in a matrix, the locking structure 22 and the output pole accommodating portion 21 are of an injection-molded integral structure, and the locking structure 22 is located in the inner center of the output pole accommodating portion 21. The output pole accommodating part 21 and the end plate main body 2 are integrated into a whole through injection molding, so that the arrangement of output pole base parts in the prior art is avoided, and the corresponding manufacturing cost is reduced; the output pole accommodating part 21 is used for installing and fixing the output pole bus bar, so that the whole battery module can be quickly assembled, and the overall assembling efficiency is improved. The locking structure 22 and the end plate main body 2 are of an integral injection molding structure, so that the assembly cost is reduced, and the assembly efficiency of the battery module is improved. The provision of the plurality of weight-reduction grooves 24 reduces the weight of the end plate body 2, improving the energy density of the battery module.

The locking structure 22 of the present embodiment is a nut 22 'or a screw hole (not shown), the nut 22' includes a nut body 221, a hobbing 222 disposed outside the nut body 221, a plurality of annular grooves 223 disposed at intervals on an outer ring of the nut body 221, and an anti-glue-overflow ring 224 disposed at the bottom of the nut body 221, the setting of the hobbing 222 can limit the nut 22 'to perform a rotational motion in the end plate main body 2, so as to enhance the connection strength between the locking structure 22 and the end plate main body 2, the setting of the plurality of annular grooves 223 can limit the movement of the nut 22' in the width direction of the end plate main body 2, and also enhance the connection strength between the locking structure 22 and the end plate main body 2, and the setting of the hobbing 222 and the plurality of annular grooves 223 makes the whole battery module assembly more stable, and prolongs the service life; the provision of the glue overflow prevention ring 224 may limit the plastic from overflowing into the interior of the threads during the injection molding process, which may affect the function of the nut 22'. When the locking structure 22 is a screw hole, direct injection molding can be adopted, so that additional processes and costs are not required.

The outer diameter d of the nut 22' of the present embodiment is k1 × T, k is 1.1 ≤ k ≤ 3, and T is the total thickness of the end plate body 2; the height of the nut 22 'is 6-20mm, and the upper surface of the nut 22' exceeds the bottom surface of the output electrode accommodating part 21 by 0.1-2 mm.

The insert 1 of this embodiment is a metal material, and the quantity of insert 1 is at least two, and every insert 1 is the strip structure, and the strip structure is changeed injection moulding together with plastics, and every insert 1 all includes insert body 11, runs through in the through hole 12 of insert body 11 and sets up in insert body 11 lateral part and with the welded weld part of external structure spare. The through hole 12 is located in the center of the insert body 11, the cross section of the through hole 12 is regular or irregular, and the through hole is round, oval or square in the embodiment, so that the insert is convenient to process and assemble, and the irregular shape can be set, but the processing difficulty can be increased due to the irregular shape and can be determined according to actual requirements. The welding part 16 is used for welding the side plates of the battery module, and thus it is exposed to the outside of the end plate body 2 and is not connected to the end plate body 2.

The composite end plate processing technology of the embodiment comprises the following steps:

A. extruding (or casting) the insert 1 to form;

B. after molding, the insert 1 is subjected to computer numerical control precision machining (CNC machining) to form structures such as a second joint part 13, a locking bump 14, a second stop structure 15 and the like;

C. the surface treatment is carried out on the embedded part 1, and the surface treatment mode can be as follows: magnetic grinding, sand blasting, etching, etc., for the purpose of increasing surface roughness and improving the bonding strength with the end plate body 2;

D. cleaning the embedded part 1 and the nut 22' to remove surface impurities;

E. after cleaning, the insert 1, the nut 22' and the end plate main body 2 are integrally injection molded;

F. detection (insert 1, nut 22' joint strength detection).

Detailed description of the preferred embodiment 2

As shown in fig. 8 to 9, a battery module 100 including the composite end plate 10 according to embodiment 1 further includes a side plate 101, a plurality of batteries 102, a bus bar 103, and an output electrode bus bar 104, the number of the composite end plate is at least two, the plurality of batteries 102 are disposed in an enclosure formed by connecting the composite end plate and the side plate 101 end to end, and the plurality of batteries 102 are connected in series and parallel via the bus bar 103 and then output current via the output electrode bus bar 104.

The whole assembly of the battery module 100 is simple, and particularly, the assembly of the composite end plate 10 is almost completely omitted, so that the structure of the battery module is simplified, the production and assembly difficulty of the battery module is reduced, and the parts and the processing cost of the battery module are reduced.

Preferably, the width W of the composite end plate is K2W, W is the module width, and 0.9-K2-1; the thickness t of the composite end plate is K3L, L is the length of the module, and K3 is more than or equal to 0.07 and less than or equal to 0.1. The welding part 16 of the composite end plate 10 is welded with the side plate 101 through laser welding, friction stir welding, cold metal transition welding, resistance welding, argon arc welding or gas shielded welding, and the welding width is required to be 2-10 mm.

Detailed description of preferred embodiments 3

An energy storage device comprises the battery module of embodiment 2, and the energy storage device is manufactured by using the battery module of embodiment 2, so that the energy storage device is lower in manufacturing cost and better in safety.

The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.